In grade two we are learning to write three-digit numbers in unit, numeral, expanded, and word forms. We used place value cards to represent three digit numbers. We can expand or condense the cards to show the number in expanded form or numeral form. Students must be able to name the unit they are talking about . For example, the value of the 4 in 643 is 40. Or, the number 643 is 6 hundreds, 4 tens, and 3 ones. The commutative property allows them to change the order of the units and still have the correct value. So 643 can also be expressed as 4 tens, 3 ones, and 6 hundreds. Try asking your child to name the value of a digit in three digit numbers.
In grade one students are deepening their understanding of addition problems within 10. We began working with doubles and doubles plus one facts. For example,
3 + 3 = 6. The doubles plus one fact is
3 + 4 = 7. Since one more is added to an addend, then the sum will increase by one. Ask your child to tell you what is a doubles fact and explain how knowing a doubles fact can help solve a doubles plus one fact. Also, we explored patterns on the addition chart and looked for patterns while solving and analyzing problems with common addends.